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Meghan Markle departs her final royal engagement, Commonwealth Day 2020

Meghan, Duchess of Sussex departs the Commonwealth Day Service 2020, marking her final engagement as a working royal.

She and Prince Harry will officially finish their royal duties on 31 March.

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Queen Elizabeth II arrives to attend the annual Commonwealth Day Service

Britain's Queen Elizabeth II arrives to attend the annual Commonwealth Day Service at Westminster Abbey in London, March 9, 2020. The annual service, organised by the Royal Commonwealth Society, is the largest annual inter-faith gathering in the United Kingdom.

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Prince William and Kate Middleton at the 2020 Commonwealth Day Service

Prince William and Kate Middleton, the Duke and Duchess of Cambridge, arrive to attend the annual Commonwealth Day Service at Westminster Abbey in London, Monday, March 9, 2020.

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Prince Harry and Meghan Markle at the 2020 Commonwealth Day Service

Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex arrive to attend the annual Commonwealth Service at Westminster Abbey on March 9, 2020 in London, England.

All eyes were on the couple, who from March 31, 2020, will no longer 'senior working members' of the royal family – making this their last official commitment.

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Prince Charles and Camilla, Duchess of Cornwall, laugh with a priest

Prince Charles and Camilla, Duchess of Cornwall shared a laugh with a member of the clergy outside Westminster Abbey.

They attended the annual Commonwealth Day service in coordinating navy outfits.

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The 'Fab Four' reunite for the last time

Prince Harry, Duke of Sussex, Meghan, Duchess of Sussex, Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge: the 'Fab Four' joined the Queen as they processed out of the church following the service – their final 'working' engagement together.

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Watching the service

The two royal couples were seated a row apart, and didn't have much chance to interact.

It's a slightly different picture to this time last year....

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Sophie, countess of Wessex, attends the Commonwealth Service 2020 with Prince Edward

Sophie, Countess of Wessex, donned a contrasting white and navy dress as she attended the 2020 Commonwealth Day Service with Prince Edward in London.

The Countess recently returned from a brief royal trip to South Sudan, where she met with local women's groups.

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Kate Middleton and Prince William greet children, 2020

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge greeted young well wishers as they departed the Commonwealth Day Service 2020.

Kate crouched to accept a bouquet of flowers from a small girl before departing.

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Camilla the Duchess of Cornwall arrives at the Commonwealth Day Service, 2020

Camilla, the Duchess of Cornwall, donned a luxe navy coat and hat as she attended the Commonwealth Service 2020.

In 2019 she accidentally arrived wearing an outfit that was almost identical to the purple ensemble the Queen was wearing.

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The 'Fab Four' on Commonwealth Day, 2019

Kate, the Duchess of Cambridge, Prince William, Prince Harry and Meghan, the Duchess of Sussex attended the Commonwealth Service with other members of the royal family at Westminster Abbey in London, Monday, March 11, 2019.

Commonwealth Day had a special significance last year, as 2019 marked the 70th anniversary of the modern Commonwealth - a global network of 53 countries and almost 2.4 billion people, a third of the world's population.

It was one of Meghan's last official royal engagements before going on maternity leave, and she was heavily pregnant with son Archie at the time.

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The Duke and Duchess of Sussex during a visit to Canada House in London for a Commonwealth Day youth event celebrating the diverse community of young Canadians living in London and around the UK.

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Meghan accepts flowers from children, 2019

The Duchess of Sussex received a bouquet of flowers as she and Prince Harry left Canada House in London last year.

They had attended a Commonwealth Day youth event celebrating the diverse community of young Canadians living in London and around the UK, before heading to the Commonwealth Service at Westminster Abbey.

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Queen Elizabeth on Commonwealth Day, 2019

Queen Elizabeth II carried a vibrant bouquet of flowers as she left the Commonwealth Service at Westminster Abbey, London, 2019.

But there had been an awkward moment when she arrived earlier that day...

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Prince Charles and Camilla at Westminster Abbey, 2019

Camilla, the Duchess of Cornwall, made a fashion faux pas at the Commonwealth Day service in 2019.

She accidentally arrived in an outfit almost identical to what the Queen was wearing, both donning vibrant purple ensembles.

Talk about a fashion nightmare.

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The 'Fab Four' at the Commonwealth Service, 2018

The Duke and Duchess of Cambridge, Prince Harry and Meghan Markle attended the Commonwealth Service at Westminster Abbey on March 12, 2018.

Kate was pregnant with her and William's third child, Prince Louis, at the time and it was Meghan's first time attending.

The Duchess of Sussex hadn't yet joined the royal family, but was invited as Harry's bride-to-be.

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The Royal Family at the Commonwealth Day service, 2018

The Royal Family sat quietly at the Commonwealth Day service in 2018, observing the important day on the royal calendar.

The day recognises the unity of the Commonwealth and the Queen as its leader.

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Meghan and Harry laugh with archbishops, 2018

Prince Harry and Meghan Markle were full of laughs as they chatted with Archbishop Angeaelos, Coptic Orthodox Archbishop of London, in Dean's Yard after attending the Commonwealth Service.

All eyes were on Meghan, as it was her first time celebrating Commonwealth Day with the royals.

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Queen Elizabeth leaves the Commonwealth Service, 2018

Queen Elizabeth II always departs the Commonwealth Service at Westminster Abbey with a bouquet of blooms, as seen here in 2018.

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The royal family enter Westminster Abbey, 2017

Queen Elizabeth II, the Duke of Edinburgh, the Prince of Wales, and the Duchess of Cornwall arrive for the Commonwealth Service in 2017.

Prince William and Kate Middleton were notably absent on the day - reportedly because William was off on a ski trip!

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Prince Harry laughs with members of the public, 2017

Following the 2017 Commonwealth Day service at Westminster Abbey, Prince Harry joked and laughed with a group of school children waiting outside.

He was the lone young royal at the event that year, as William and Kate skipped it and Meghan Markle wasn't a member of the royal family yet.